I'm looking to reattach my M3 spoiler as the edge's have started the peel off the boot lid. I purchased one of those ebay replica's and used the bonding stuff that came with it but the edges just started coming away. I then had a bodyshop put the spoiler back on as a favour whilst other work was being done on my car. Again, the edges have started to come away.
What else can I use that is remotely safe but is going to be stronger than what's already been tried?